Cutter-head.



UNITED sT TEs PATENT OFFICE.

No. 8oo,143.

. Specification of Letters Patent.

Patented. Sept. 26, 1905.'

Application filed. March 6, 1905. Serial No. 248594.

To all whom it may concern:

Be it known that I, WILLIAM R. FOX, a citizen of the United States,residing in the city of Grand Rapids, county of Kent, State of Michigan,have invented certain new and useful Improvements in Cutter-Heads, ofwhich the following is a specification.

i This invention relates to improvementsin cutter-heads. i i

` The objects of this invention are to provide an improved cutter-headwhich is simpleand economical to manufacture and very eflective anddurable in use; to provide an improved cutter-head which may be readilyand easily sharpened when dulled; to provide an improved cutter -headwhich can be operated with a relatively small expenditure of power.

Further objects and advantages of my invention will clearly appear fromthe detailed description to follow.

I accomplish the objects of my inven'tion by the 'devices and meansdescribed in the following specification.

The invention is clearly deined, and pointed out in the claims.

A structure embodying the features of my invention is clearlyillustrated in the accompanying drawings, forming a part of thisspecification, in whichv Figure 1 is a face view of my improvedcutter-head, showing one of the two circular saws with two intermediatecutters interposed therebetween. Fig. 2 is a view of my .improved.cutter-head and shows the two circular, saws and intermediate cuttersbetween. Fig. 3 is an enlarged view of a detached portion of one, of thecircular saws forming part of the cutter-head. Figs. 4:,- 5, and 6 arede'- tail vertical sectional views taken, respectively, along the lines4 4, 5 5, and 6 6 of Fig. 3. V

In the drawings the sectional views are taken looking in the directionof the little arrows at the ends of the section-lines, and similarletters of reference refer to similar parts throughout the severalviews.

A represents one of the symmetrical and opposite circular saws of thecutter-head, which is suitably mounted upon the arbor E. The teeth ofeach circular saw are arranged in groups, each group being separatedby arelatively large clearance D and consisting of a-large clearer-tooth A',having a top cutting edge of substantially the same width as thethickness of and perpendicular to the face of the' saw, a long series ofcutting-teeth a', 'a small clearer-tooth A", having a top cutting edgeof substantially the same width as the thickness of and perpendicular tothe face of the saw, and a short series of cutting-teeth a. It will thusbe observed that the clearer-teeth A' and A" 'have chiselelike cuttingedges.

The peripheral edge of the circular saw A, from which are formed thecutting-teeth a is beveled on the inside to a thin knife-like edgetoward the outside of the circular saw from' the rear of theclearer-tooth A' to the front edge of the clearer-tooth A". Theperipheral edge of the circular saw A, from which are formed thecutting-teeth a, is beveled on the outside to a thin knife-like edgetoward the inside from the rear of the clearertooth A" to the clearanceD.

The cutting-teeth a and a' are cross-cutting teeth having a slight pitchwith their oblique faces toward the outside and the inside,respectively, of the circular saw, their cutting edges lying,respectively, in the planes of the inside and outside faces of the saw.

It will thus be apparent that my improved cutterhead' may be' madeeither with one group or a series of groups of teeth. Further,

'the clearer-tooth A" may be formed at any point along the peripheraledge in any group. I prefer, however, a saw having four groups of teeth,one group in each quadrant, and the clearer-tooth A" formed at a pointmuch nearer the rear of its group, so that the number of cutting-teeth aand a' may be in the proportion of one to four in order to secure thebest results in cutting eifect and economy in power. The intermediatecutter B, interposed between the circular saws, preferably consists of abar With'oppositely-extending teeth B' B', having chisel-like cuttingedges of substantiallythe same width as the thickness of theintermediate cutter. The intermediate cutter may, however, be of anydesirable form suitably adapted therefor and as many may be used as thewidth of cut requires. p

If it is required to cut a narrow groove, two symmetrical and oppositecircular saws may be used without intermediate cutters or two v sawswith a single intermediate cutter may be i Letters Patent, is-

1. In a rotary eutter-head, in combination, an arber; a pair ofsymmetrical and opposite circular saws, having teeth arranged in groups,each group being separated by a relatively large elearance andconsisting of a relatively large clearer-tooth having a chisel-like topcutting edge of substantially the same width as the thickness of thesaw, a long seriesof cutting-teeth beveled on the inside of the saw andhaving their cutting edges in the plane of the outside face of the saw,a relatively small clearer-tooth having a ehisel-like top cutting edgeof substantially the same width as the thickness of the saw, a shortseries of cuttingteeth beveled on the outside of the saw and havingtheir cutting edges in theplane of the inside face of the saw; and anintermediate eutter interposed between the two circular saws,substantially as described.

2. In a rotary eutter-head, in 'eombinatiom an arber; a pair ofsymmetrical and opposite circular saws, having teeth arranged in groups,each group being separated by a relatively large elearance andconsisting of a relatively large elearer-tooth having a ehisel-like topcutting edge of substantially the same width as the thiekness of thesaw, a long series of cutting-teeth beveled on the inside of the saw andhaving their cutting edges in the plane of the outside face of the saw,arelatively small elearer-tooth having a ehisel-like top cutting 'edgeof substantially the same width as the thickness of the saw, a shortseries of cuttingteeth beveled on the outside of the saw, and havingtheir cutting edges inthe plane of the inside face of the saw,substantially as described.

3. In a rotary cutter-head, in eombination, an arber; a pair ofsymmetrieal and opposite circular saws, having teeth arranged in groups,each group being separated by a 'elearance and consisting ofelearer-teeth, a series of cutting-teeth beveled on the inside of thesaw and having their cutting edges in the plane of the outside face ofthe saw, a series of cutting-teeth beveled on the outside of the saw andhaving their cutting edges in the plane of the inside face of the saw;and an intermediate eutter interposed between the two circular saws,substantially as described.

4:. In a rotary eutter-head, in ombination, an arber; a pair of oppositeand symmetrieal circular saws, having teeth arranged in groups, eachgroup 'being separated by a elearance 'and consisting of clearer-tceth,a series of cutting-teeth beveled on the inside ot' the saw and havingtheir cutting edges in the plane of the outside face of the saw, aseries of cutting-teeth beveled on the outside of the saw and havingtheir cutting edges in the plane of the inside face of the saw,substantially as described.

5. In a rotary eutter-head, in com binaton, an arbor; a pair of circularsaws having teeth arranged in groups, each group being separated by aelearance and consisting of clearerteeth and a series of cross-cuttingteeth with a larger number of their cutting edges in the plane of theoutside face of the saw than in the plane of the inside face of the saw;and an intermediate cutter interposed between the two circular saws,substantially as described.

6. In a rotary eutter-head, in coinbination, an arber; a pair ofcircular saws having teeth arranged in groups, each group beingseparated by a elearance and consisting of clearerteeth and a series ofcross-cutting teeth with a larger number of their cutting edges in theplane of the outside face of the saw than in the plane of the insideface of the saw, substantially as described.

7. In a rotary eutter-head, in eonbination, an arbor; two circular saws,the outside face of each saw being provided with the majority ofcross-cutting teeth; and an intermediate eutter interposed between thetwo circular saws, substantially as described.

8. In a rotary cutter-head, in eonbination, an arbor; and two circularsaws, the outside face of each saw being provided with the najority ofcross-cutting teeth, substantially as described.

9. In a rotary cutter-head, the heroin-described circular saw havingteeth arranged in groups, each group being separated by a largeelearance and consisting of a relatively large elearer-tooth having aehisel-like top cutting edge of substantially the same width as thethickness of the saw, a long series of cuttingteeth beveled on theinside of the saw and having their cutting edges in the plane'of theoutside face of the saw, a relatively small clearer-tooth having achisel-like top cutting edge of substantially the same width as thethickness of the saw, a short series of cuttingteeth beveled on theoutside of the saw and having their cutting edges in the plane of theinside face of the saw, substantially as described.

10. ln a rotary cutter-head, the herein-described circular saw havingteeth arranged in groups, each group being separated by a clearance andconsisting of clearer-teeth, a series of cutting-teeth beveled on theinside of the saw and having their cutting edges in the IOO plane of theoutside face of the saw, a series their cuttingedges in' the plane ofone of the Io of cutting-teeth beveled onthe outside face faces of thesaw, substantially as described. of the saw and having their cuttingedges in In wtness whereof I have hereunto set my the plane of theinside face of the saw, subhand and seal in presence of two witnesses( 5stantiallylas described. V 11. In a rotary cutter-head, the herein-de-WILLIAM scribed circular saw having teeth arranged in Witnesses groups,each group consisting of clearer teeth, ETTA MCOMBER, and cross-cuttingteeth with a majority of .r ETTA HELMKA.

